The best solution is to re-create project with libGDX setup tool and copy all source code and assesassets into it from old project. .project file is file that contains information about project Eclipse should know. Do you use Gradle? If so, do you import project into Eclipse as Gradle Project (right) or as Eclipse Project (wrong)? And it's pretty bad idea to use Android Studio and Eclipse simultaneously. Both generate own special files that no one except IDE needs.
The best solution is to re-create project with libGDX setup tool and copy all source code and asses into it from old project. .project file is file that contains information about project Eclipse should know. Do you use Gradle? If so, do you import project into Eclipse as Gradle Project (right) or as Eclipse Project (wrong)? And it's pretty bad idea to use Android Studio and Eclipse simultaneously. Both generate own special files that no one except IDE needs.
The best solution is to re-create project with libGDX setup tool and copy all source code and assets into it from old project. .project file is file that contains information about project Eclipse should know. Do you use Gradle? If so, do you import project into Eclipse as Gradle Project (right) or as Eclipse Project (wrong)? And it's pretty bad idea to use Android Studio and Eclipse simultaneously. Both generate own special files that no one except IDE needs.
The best solution is to re-create project with libGDX setup tool and copy all source code and asses into it from old project. .project file is file that contains information about project Eclipse should know. Do you use Gradle? If so, do you import project into Eclipse as Gradle Project (right) or as Eclipse Project (wrong)? And it's pretty bad idea to use Android Studio and Eclipse simultaneously. Both generate own special files that no one except IDE needs.